I won't lie to you. This website isn't the best place to go if you're looking for reliable Web Design advice. Stack Overflow is a programming community and programmers rarely know anything about design. If you want to get some real advice then I would strongly recommend the main Web Design/Development forums on the Internet, especially SitePoint.
That being said, as a former freelance Web Designer/Developer I'll offer my input on the issue. Not that you should value it, of course. After all, this is a programming website.
NEVER EVER SAY CSS LAYOUT GENERATOR EVER AGAIN! If you're going to seriously get into designing web pages then you need to learn semantic XHTML and CSS first. Whilst many people tout W3Schools as the definitive resource I see it as a programmers answer (i.e. not very good) and would prefer that you read up on the subject using...Google. There are countless examples of great websites to pick up the basics of Web Design/Development that Google is probably the best website for the job. Also, with a plethora of new websites offering this information you know it's going to be more improved than W3Schools. You'll seriously want to get clued-up on writing your design because it'll be much harder to fix things later on in the project.
If you're going to be designing web pages it would be a good idea to learn what actually makes a good design. Check out CSS Vault for a fantastic resource of some of the best-designed web pages around, of course with all the source code intact so you can have a play around with their code and see how they've managed some of the wonderful effects they've produced. I've learnt more than a thing or two from websites that have been featured on CSS Vault. On top of that you should read up on Web Design from the big Web Design/Development sites. Two of my favourites are SitePoint and A List Apart, two names that you'll near time and time again when you hear people talk about resources. Browse those websites, check their forums, see what REAL Web Designers/Developers are using, not what programmers are using.
On the subject of CSS Frameworks; they do help! The problem with using them is that you'll often spend so much time looking for a worthwhile framework that you could have finished most of the CSS for your website yourself. You'll either love them or hate them, but many people will say that they're not necessary.
Once you've got your mind set on what a good design looks like and you've got the resources you need to make something of value I suggest that you get to work! In reality when you're designing a web page all you really need is a text editor with a save function, an image manipulation program, a browser window and FireBug. An IDE helps a lot of people, but if you do use one then you'll definitely want to work in its text mode. I use NotePad++ or Emacs exclusively but a lot of people like to use Aptana Studio, so it may be worth a look.
When you're getting to actually building the code behind your website you can't really go much worse than your favourite IDE/Text Editor and a source control tool. As a Java programmer you're better suited to talk about programming so I won't lecture you on a subject you already know.
In the end, Web Design is going to take time and many of the tools that we choose to use that we claim will "save time" save very little in reality. If you're not a design guru then it will take you a substantial amount of time to create a great-looking website. It's a fact of life. Call me old-fashioned (a funny word coming from a 21 year old) but I still think that the quickest way is to sketch a design out on a piece of paper (a image program if really necessary) and to just get out there and make the damn thing! Again, I'll have to take this hunting for the silver bullet mentality as a programmers trait, one that really won't help that much when designing, because designing a web page is vastly different to writing a Java program.
In short, ignore everything you read here, read what REAL designers are doing and just make the damn thing!